Malaysia’s First “Microinverter + C&I Storage” Project: Hoymiles Empowers Manufacturing with Energy Independence

In Johor, Malaysia, a pioneering commercial and industrial (C&I) photovoltaic + storage project has become the country’s first to deeply integrate Hoymiles microinverters with industrial energy storage. Delivered with partner PATHGREEN ENERGY for a remote concrete prefabrication manufacturer, the 572.88 kW PV system paired with 250 kW / 522 kWh of storage creates a practical pathway to reliable, cost-effective power without compromising production continuity.

Story 

Located in a remote area of Johor state, a concrete prefabrication manufacturer has faced mounting electricity costs driven by ongoing tariff adjustments. For an energy-intensive operation, power expenses have increasingly weighed on overall profitability.

While some traditional energy solutions have been attempted locally, space constraints and demanding industrial conditions often make efficient installation and long-term stable operation difficult. Moreover, the remote location of the factory means limited access to professional operations and maintenance (O&M) resources, resulting in slower response times and higher maintenance costs whenever issues arise.

The enterprise therefore needed an energy solution that combined high reliability with strong economics.

Solution 

To meet the above challenges, Hoymiles delivered a tailored, integrated “microinverter + C&I storage” solution designed for complex, space-limited industrial environments and remote deployment conditions.

Modular design for rapid deployment

With the project located far from major service hubs and logistics conditions constrained, the modular, plug-and-play design of both the microinverters and storage systems became a key enabler.

From site survey and system design through commissioning and grid connection, the project was completed in roughly three months. Microinverter installation efficiency improved by about 70% compared with conventional approaches, while the storage systems were also positioned and commissioned quickly, shortening the construction cycle and payback period.

MIT microinverters: safer design, higher yield, module-level O&M

On the PV side, 116 MIT-5000-8T microinverters were deployed. The DC-side voltage remains below 140 V, fundamentally reducing the risks associated with high-voltage DC arcing, including fire and electric shock.

Each MIT-5000-8T supports up to 8 PV modules with 4 independent MPPTs and a wide 12–136 V MPPT range, allowing every input to operate at its maximum power point and helping maximize energy harvest. With 5000 W output power, 20 A maximum input current, and 97.4% peak efficiency, the MIT series is well-suited to high-power modules while lowering per-watt system costs.

Module-level monitoring via the S-Miles Cloud platform provides visibility into module power and generation performance in real time, supporting proactive O&M, especially valuable for remote sites where maintenance resources are limited.

HoyUltra 2: stable operation in heat, humidity, and harsh conditions

For storage, two HoyUltra 2 fully liquid-cooling energy storage systems deliver 250 kW / 522 kWh. Built for Malaysia’s hot and humid climate, the systems can maintain rated power even at 50 °C ambient temperature. They achieve up to 90.3% round-trip efficiency (equivalent cycle efficiency >88.4%).

The TMS unit is mounted on the top of the enclosure to help prevent rainwater and dust from entering. With IP55 protection, the system is designed to handle challenging environments such as high humidity and salt fog.

Safety is reinforced through a multi-layer “active + passive + ultimate” fire protection architecture, combining cloud-based early warning, PACK-level fire suppression, and cabinet pressure relief to provide comprehensive risk control.

Cloud integration to simplify remote O&M and optimize value

Connected to the Hoymiles cloud platform, the system supports functions including cloud-based fault warnings, electricity-price revenue management, charge/discharge plan scheduling, and remote work-order dispatch. These capabilities significantly reduce the difficulty and cost of O&M in remote areas.

Success 

Lower bills, uninterrupted operations

With module-level PV optimization and intelligent storage scheduling working together, overall generation efficiency and energy utilization have exceeded expectations. The system delivers substantial electricity cost savings while helping ensure continuous factory operations.

Customer voice

A client representative shared: “We chose Hoymiles because their products are not only highly efficient and reliable but also enable fast deployment. Completing construction in a remote area was a major challenge, yet the Hoymiles team overcame it. The system installed quickly, commissioned smoothly, and has already helped us save significantly on electricity bills while keeping production running without interruption.”

A replicable model for industrial energy autonomy

This landmark project validates the feasibility and performance of the “microinverter + C&I storage” approach in complex industrial scenarios. By combining innovative technology, robust products, and efficient delivery, Hoymiles has created a practical reference for manufacturing enterprises in Malaysia and across Southeast Asia pursuing energy autonomy and sustainable cost control.